This circumstance led to experiments to ascertain the preservative nature of coal tar. More than fifty years ago W. H. Hyett and others impregnated wood with gas tar, and reported that cuch wood ...

Across the world, coal had been used as a source of heat for thousands of years. It produced more heat and was cleaner than burning wood. One important use of coal was the making of iron ...

by the use of wood for locomotive fuel, we long ago (when no other kind was used) repeatedly directed attention to the substitution of coal for wood on our railroads Stubborn at one period in ...